Jake 'The Snake' Roberts -- Out of the Hospital ... But Docs Found More Cancer

Jake "The Snake" Roberts is out of the hospital following a scary stay for double pneumonia, but during his first public appearance Saturday night he announced he's fighting cancer again.

Roberts surprised the crowd at a Future Stars of Wrestling show in Las Vegas shortly after being released ... telling the crowd how he's feeling.

Jake says during his 3 day hospital stay ... doctors discovered some cancer inside his chest that needs to be removed. He had a cancerous tumor in his leg removed earlier this year. But he's not worried about it, Jake says he's fought worse.

His voice is weak, but it's pretty bad ass to see the Hall of Fame wrestler's positive outlook on his fight with cancer.